I just put my pleco into my 55 gal tank. I had him in quarenteen for about a month, and he was ready to go into my goldie tank. But he is eating like constantly, and there is about a 10 inch long poo

The floor and back wall of the tank is completely algae filled, so I'm wondering if it is possible for plecos to eat too much and die or anything? He is a choclate albino pleco, and only about 3 inches long. Thanks!